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This information is reliable as of patch 2.0.201.56.
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Caves of Qud has a bartering system where items vary in price based on a multitude of factors. Commerce is the base value that is specified for each item that is then multiplied or divided by a multiplier depending on selling or buying.
Trading Multiplier Formula
$ {\text{Multiplier}}=0.07\times ({\text{Ego Modifier}}+2{\text{(if Snake Oiler)}})+0.35 $
If the player has Glotrot, Ego modifier and Snake oiler no longer have an effect and returns a flat -3. The equation then becomes
$ {\text{Multiplier (with Glotrot)}}=0.14 $
The multiplier cannot be higher than 0.95(achievable with +9 Ego modifier or +7 Ego modifier with Snake Oiler) and the multiplier cannot be lower than .05 (-5 Ego modifier).
When buying an item from a trader, this multiplier is divided by the value of the item in question. When the item is sold, the value is multiplied by the multiplier.
Reputation Effect on Trade Prices
Reputation with the merchant also affects trade prices, acting essentially as a bonus or penalty to the player's ego modifier.
| Reputation with merchant
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Bonus applied to Ego Modifier for Trade
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| 600 or more
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+3 bonus
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| 250 to 599
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+1 bonus
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| -249 to 249
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0
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| -599 to -250
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-1 penalty
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| -600 or less
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-3 penalty
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Sacred Well Reputation Formula
How much reputation the Sacred well gives is also dependent on the commerce value of the object.
$ {\text{Reputation}}={\text{Commerce}}/10 $
Reputation cannot go lower than 1, and if an object that has no specified value defaults to 10 reputation.
Book Experience Formula
$ {\text{Exp}}={\text{Floor}}({\frac {Commerce^{2}}{25}}) $
Modifications and Commerce
Each modification has a Value attribute that is multiplied against the base Commerce value to get the new modified value.
Items by Commerce Value
| Page | Commerce | Category |
| Page | Commerce | Category |
| Otherpearl | 33,333.0 | Bracelets |
| Hand-E-Nuke | 10,000.0 | Grenades |
| Kesil Face | 10,000.0 | Masks |
| Shemesh Face | 8,000.0 | Masks |
| Circle of light in the chord of Shugruith | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Qas | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Rermadon | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Ehalcodon | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Agolgot | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Qon | 7,500.0 | Floating Nearby |
| Circle of light in the chord of Bethsaida | 7,500.0 | Floating Nearby |
| Sail from the Great Machine | 6,666.0 | Cloaks |
| Gear from the Great Machine | 6,666.0 | Shields |
| Flange from the Great Machine | 6,666.0 | Armor |
| Gauge from the Great Machine | 6,666.0 | Masks |
| Earth Face | 6,500.0 | Masks |
| Zetachrome lune | 6,000.0 | Armor |
| Levant Face | 5,000.0 | Masks |
| Mecha power core | 4,000.0 | Items |
| Olive Face | 4,000.0 | Masks |
| Null Face | 4,000.0 | Masks |
| Swarm rack | 3,200.0 | Heavy Weapons |
| Timecube | 3,000.0 | Trinkets |
| Mental aggregator | 2,265.0 | Helmets |
| Psychodyne helmet | 2,140.0 | Helmets |
| Transkinetic cuffs | 2,100.0 | Bracelets |
| Cathedra with sapphire tracery | 2,000.0 | Cybernetics |
| Fist of the Ape God | 2,000.0 | Cudgels |
| Phase cannon | 2,000.0 | Heavy Weapons |
| Cathedra with black opal tracery | 2,000.0 | Cybernetics |
| Cathedra with ruby tracery | 2,000.0 | Cybernetics |
| Spaser rifle | 2,000.0 | Rifles |
| Blast cannon | 2,000.0 | Heavy Weapons |
| Cathedra with white opal tracery | 2,000.0 | Cybernetics |
| Flawless crysteel shardmail | 1,900.0 | Armor |
| Leyline puppeteers | 1,750.0 | Gloves |
| Crystalline jile | 1,666.0 | Short Blades |
| Black mote | 1,666.0 | Floating Nearby |
| Crystalline halo | 1,666.0 | Helmets |
| Chassis plate | 1,600.0 | Cloaks |
| Zetachrome gloves | 1,500.0 | Gloves |
| Va'am's lens | 1,500.0 | Shields |
| High-energy thermo cask | 1,500.0 | Armor |
| Zetachrome long sword | 1,500.0 | Long Blades |
| Kah's loop | 1,500.0 | Armlets |
| Tri-hologram bracelet | 1,500.0 | Bracelets |
| Zetachrome battle axe | 1,500.0 | Axes |
| Zetachrome warhammer | 1,500.0 | Cudgels |
| Zetachrome pumps | 1,500.0 | Footwear |
| Light rail | 1,500.0 | Rifles |
| Two-handed zetachrome long sword | 1,500.0 | Long Blades |
| Dagasha's spur | 1,500.0 | Hats |
| Nacham's ribbon | 1,500.0 | Cloaks |
| Zetachrome halberd | 1,500.0 | Axes |
| Spaser pistol | 1,500.0 | Pistols |
| Zetachrome apex | 1,500.0 | Helmets |
| Zetachrome hammer | 1,500.0 | Cudgels |
| 3D cobblers | 1,400.0 | Footwear |
| Zetachrome dagger | 1,390.0 | Short Blades |
| High-voltage arc winder | 1,250.0 | Pistols |
| Chiral rings | 1,250.0 | Floating Nearby |
| Longreach grappling gun | 1,250.0 | Pistols |
| Enigma cone | 1,250.0 | Armor |
| Nullray pistol | 1,200.0 | Pistols |
| Crysteel shardmail | 1,200.0 | Armor |
| Hand rail | 1,050.0 | Pistols |
| Anti-gravity boots | 1,000.0 | Footwear |
| Gas tumbler | 1,000.0 | Equipment |
| Di-thermo beam | 1,000.0 | Pistols |
| Chain laser | 1,000.0 | Heavy Weapons |
| Thermo cask | 1,000.0 | Armor |
| Psychic meridian | 999.0 | Helmets |
| Dazzle cheek | 999.0 | Masks |
| Palladium mesh tabard | 925.0 | Cloaks |
| Eigenrifle | 900.0 | Rifles |
| Psychal fleshgun | 900.0 | Pistols |
| Night-sight interpolators | 900.0 | Eyewear |
| Nano-neuro animator | 900.0 | Tools |
| Helping hands | 900.0 | Backpacks |
| Kaleidocera cape | 900.0 | Cloaks |
| Kaleidocera muffs | 900.0 | Gloves |
| Kaleidocera krakows | 900.0 | Footwear |
| Gyrocopter backpack | 800.0 | Backpacks |
| Point-defense drone | 800.0 | Floating Nearby |
| Nanoweave vest | 795.0 | Armor |
| Geomagnetic disc | 750.0 | Thrown Weapons |
| Freeze ray | 750.0 | Rifles |
| Plastifer chem vest | 750.0 | Armor |
| Space inverter | 750.0 | Pistols |
| Linear cannon | 750.0 | Heavy Weapons |
| Arc winder | 750.0 | Pistols |
| Laser rifle | 750.0 | Rifles |
| Hypertractor | 750.0 | Rifles |
| Flawless crysteel mace | 720.0 | Cudgels |
| Flawless crysteel great sword | 720.0 | Long Blades |
| Flawless crysteel warhammer | 720.0 | Cudgels |
| Flawless crysteel battle axe | 720.0 | Axes |
| Flawless crysteel long sword | 720.0 | Long Blades |
| Flawless crysteel halberd | 720.0 | Axes |
| Precision nanon fingers | 700.0 | Gloves |
More...
